Patterns of electrical properties change of heavy metal-organic compound contaminated media in soil-groundwater systems: From laboratory experiments to site application

被引：0

作者：

Zhu, Xiaobin ^{[1
]}

Xiong, Guiyao ^{[1
]}

Nie, Huijun ^{[1
,2
]}

Miao, Aihua ^{[3
]}

Yu, Guangwen ^{[3
]}

Wang, Yue ^{[3
]}

Zeng, Xiankui ^{[1
]}

Chen, Kouping ^{[1
]}

Wu, Jianfeng ^{[1
]}

Wu, Jichun ^{[1
]}

机构：

[1] Nanjing Univ, Sch Earth Sci & Engn, Key Lab Surficial Geochem, Minist Educ, Nanjing 210023, Peoples R China

[2] Jiangsu Environm Protect Grp Co Ltd, Nanjing 210036, Peoples R China

[3] China Natl Chem Civil Engn Co Ltd, Nanjing 210031, Peoples R China

来源：

SCIENCE OF THE TOTAL ENVIRONMENT | 2024年 / 945卷

基金：

中国国家自然科学基金;

关键词：

Heavy metal-organic compound pollution; ERT; Induced polarization method; Random forest model; WASTE-DISPOSAL SITE; INDUCED-POLARIZATION; COMPLEX CONDUCTIVITY; UNCONSOLIDATED SEDIMENTS; POROUS-MEDIA; RESISTIVITY; TRANSPORT; INVERSION; MODEL;

D O I：

10.1016/j.scitotenv.2024.174126

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Differences in electrical properties of media are the basis for determining the type and extent of contamination using geophysical methods. However, differences in heavy metals and organic matter complicate the electrical properties of compound -contaminated media, and existing geophysical methods cannot independently identify compound contamination. Therefore, this study proposes a geophysical detection system that combines electrical resistance tomography (ERT) and induced polarization methods and establishes a solid theory as the basis for the system application through laboratory experiments, model analysis, and site applications. The study reveals that as the organics volume proportion increases, the resistivity and normalized chargeability of contaminated media increased slowly, followed by a rapid increase, and finally reached a stable state. The specific type of compound significantly influences the electrical properties, while the resistivity of different kinds of compoundcontaminated media reaches the same maximum value as the organics volume proportion increases. The medium type determines the contaminated media's lower resistivity limit and upper normalized chargeability limit. Additionally, the interplay between heavy metal type, content, and medium complicates the electrical properties of the media, with the compound type exerting a significant impact on resistivity. Archie's law and random forest modeling reveal that the inflection point for resistivity change occurs at 40 % and 80 % organics volume proportions, while the inflection point for normalized chargeability change occurs at 30 % and 70 % organics volume proportions in compound -contaminated media. These inflection points depend on the types of compounds, compositions, proportions, and media, and their importance for the electrical properties of the media changes with the increasing organics volume proportion. Based on the changing patterns of resistivity and normalized chargeability in heavy metal -organic compound contaminated media, the modified geophysical detection system can effectively identify the pollution type and intensity, which provides accurate pollution information to develop effective treatment strategies.

引用

页数：13